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    A WIND-TUNNEL INVESTIGATION OF THE LIMITATIONS OF THERMISTOR ANEMOMETRY

    Source: Journal of Meteorology:;1951:;volume( 008 ):;issue: 003::page 182
    Author:
    Sanford, Edward R.
    DOI: 10.1175/1520-0469(1951)008<0182:AWTIOT>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: An experimental investigation of the characteristics of thermistors, when used as anemometers, has been made. The various modes of operating thermistor micro-anemometers are studied, and the sensitivity and errors discussed. A variable-temperature, variable-speed wind tunnel was constructed for this investigation, to determine the power dissipated in the thermistor as a function of wind speed, wind direction, and air temperature. The thermal lag of the thermistor to environmental changes was studied. It was concluded that operating the thermistor at constant resistance, by means of a specially designed bridge, showed the greatest promise in that this mode of operation was the most sensitive to wind-speed changes, the least sensitive to ambient-temperature changes, and eliminated lag to a great extent. Operated at constant resistance, the lag time of the response of the thermistor to a ?step-function? air-speed change was about 0.085 sec, the error in air-speed indication due to a degree change in ambient temperature was approximately 0.5 per cent on the average, and for direction changes up to 20 per cent. However, much work, particularly on the elimination of temperature and directional errors, must still be done to make thermistor anemometers practical.
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      A WIND-TUNNEL INVESTIGATION OF THE LIMITATIONS OF THERMISTOR ANEMOMETRY

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4149327
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    contributor authorSanford, Edward R.
    date accessioned2017-06-09T14:10:24Z
    date available2017-06-09T14:10:24Z
    date copyright1951/06/01
    date issued1951
    identifier issn0095-9634
    identifier otherams-13833.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4149327
    description abstractAn experimental investigation of the characteristics of thermistors, when used as anemometers, has been made. The various modes of operating thermistor micro-anemometers are studied, and the sensitivity and errors discussed. A variable-temperature, variable-speed wind tunnel was constructed for this investigation, to determine the power dissipated in the thermistor as a function of wind speed, wind direction, and air temperature. The thermal lag of the thermistor to environmental changes was studied. It was concluded that operating the thermistor at constant resistance, by means of a specially designed bridge, showed the greatest promise in that this mode of operation was the most sensitive to wind-speed changes, the least sensitive to ambient-temperature changes, and eliminated lag to a great extent. Operated at constant resistance, the lag time of the response of the thermistor to a ?step-function? air-speed change was about 0.085 sec, the error in air-speed indication due to a degree change in ambient temperature was approximately 0.5 per cent on the average, and for direction changes up to 20 per cent. However, much work, particularly on the elimination of temperature and directional errors, must still be done to make thermistor anemometers practical.
    publisherAmerican Meteorological Society
    titleA WIND-TUNNEL INVESTIGATION OF THE LIMITATIONS OF THERMISTOR ANEMOMETRY
    typeJournal Paper
    journal volume8
    journal issue3
    journal titleJournal of Meteorology
    identifier doi10.1175/1520-0469(1951)008<0182:AWTIOT>2.0.CO;2
    journal fristpage182
    journal lastpage190
    treeJournal of Meteorology:;1951:;volume( 008 ):;issue: 003
    contenttypeFulltext
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